I'm getting annoyed at the time limits for mission completion in this game. I thought it was a military sim, rather than a checkpoint race. 
 
I've run out of time in missions 1 (supposedly the tutorial!) and 2. For me at the moment, mission no 2 seems uncompletable, no matter how fast  stealth-run. The guide book is awful too, giving only the wooliest account of missions and scantest regard to tactics. 
 
Does anyone know if there are time limits in the other missions too, or has anyone else been bugged by this? 

I... don't recall any time limits. Of any kind. I actually completed the first mission for an entire half hour by dragging it on.

Did you try flying the helicopter around the Island (bonus achievement) and do all the other objectives (destroy 3 sam sites)?

I only destroyed all sam sites. I don't have achievements because I have the PC version.

i havent noticed any time limits either. Maybe just dont go for the bonus achievements and play through it then by that time you will be better and can go back and get the bonus achievements.

Which part of mission 2 are you having trouble with?

I've done it now. I was having trouble with a time limit on destroying the radar base. I eventually did it by skipping the farmhouse (and missing the bonus officer "kill" there. If you trigger some checkpoint around there, you get given 5 minutes before an allied helicopter attack., which means 5 minutes of running 1 km under enemy fire from all sides to destroy the radar. 5 minutes was never enough for me, hence the time limit. 
 
I have to say mission 3 went much better though. Esecially having use of an assault vehicle's gun to fend off enemy attacks. 
 
Anyone tried coop yet?

" I'm getting annoyed at the time limits for mission completion in this game. I thought it was a military sim, rather than a checkpoint race. 
 
I've run out of time in missions 1 (supposedly the tutorial!) and 2. For me at the moment, mission no 2 seems uncompletable, no matter how fast  stealth-run. The guide book is awful too, giving only the wooliest account of missions and scantest regard to tactics.  Does anyone know if there are time limits in the other missions too, or has anyone else been bugged by this?  "

You are right about the realistic sense, but: 
 
In mission 1, on the tiny Island, I had just about killed every single last enemy, (and was trying to fly round the Island in a chopper -in itself, not really that realistic slant on war for the bonus achievement). So I could have made my own way home or pitched camp on the Island, were it not for this arbitrary  limit. 
 
Mission 2 has you destroying radar, before a heli attack. In reality, as happens elsewhere in the game, the flyboys dont go in until the radar is down. Except they do in this level, so if the rader site isn't down, the attack always fails miserably 5 minutes later.
 
My point isn't really about realism - its about enjoyment. I think they should have had an "easy" setting for idiots like me, where no-one's bothered about what time it is and all the happenings are event triggered, whenever you can make it.